Delay adding transaction IDs to inflight list until necessary

The overhead of filtering for inflight transaction IDs can be avoided until the point at which a client actually writes data to HBase. Having all other clients filter the transaction ID before this is unnecessary overhead. Although this would require another RPC, for some workloads (such as clients who don't need to read their own writes, or who often rollback prior to writing to HBase, or who checkpoint often), this might be more performant.